Math CentralQuandaries & Queries


Question from Abigail, a student:

Hi, i have an exam soon (monday =[ )
in my revison book, it shows two peoples bank accounts- and then it says

"write a formula to show the balence of Jon's bank account after n weeks of 2003"
this is the table show

Jon's Bank account

Weeks Week 1 Week 2 Week 3 Week 4 Week 5
Balance(£) 970 1035 1100 1165 1230

if you could help me that would help soooo much


Hi Abagail,

At the end of the first week Jon had £ 970.

How much did he add in the second week to get to £ 1135?
How much did he add during the third week to get to £ 1100?
How much did he add during the fourth week to get to £ 1165?

It looks like he is adding the same amount each week.

By the end of the second week he had added this amount once.
By the end of the third week he had added it twice.
By the end of the fourth week he had added it three times.

How many times had he added it by the end of the nth week?

When you have a formula for this check it for n = 2, n = 3, n = 4 and n = 5.


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